The image illustration depicts one particular way of forming an igloo. Looking from an overall perspective, it’s readily apparent that this process can be organised into 2 main stages: constructing the structure of igloo from an area covered by hard-packed snow and finishing with air holes creation for ventilation purpose.
Firstly, the hard-packed snow is sliced off by a snow saw to form ice blocks in different sizes. Subsequently, large and small blocks are assembled appropriately in circle building upwards in a way that gives a hemisphere shape with a diameter of 4 meters base. The last block is placed precisely on top of the last opening, finalising the construction of an igloo.
After that, the builders will use the loose snow for chinking which is packed into the crevices to cover the exterior 2-meter depth dome. After which, a tunnel-like entrance is made to retain the heat and avoid bad weather conditions. Ultimately, the air holes are created from the internal surface of the igloo by a specialised drill kit for ventilation. That’s the entire procedure of building an igloo from snow.